Manufacture of multiple-throw crank-shafts.



' "com il. ifilsl Pie MANUFATURE OF MULTLE-THROVJ CEMIKSHAF'S.

infonie.

^ To all 1n/7mm 'if may concern:

.lle it knovgn that l', l; "raros A. LEONARD.,

got" Schenectady, .in the c-,minty of -flchenectady and State of New York, have invented a certain new and useful improvement in the llvlann'tactin:e oit l'ilultiple-llhrow Crank-- -a shaft of such character, as 'to impart to the crank armsthe proper relative angular relation, and dispose all the journals inthe same axial line, and the crank pins in' such relation, one to another, thatV they shall have the desired sequence and angular advance, in

.their rotation about.v said axial line.

Further objects of my' invention are to in.- s'ue a perfect alinement of the crank shaft joernals and crank pins, in ordertoeconbmize labor and material in machining, and to set the cranks in proper relative` positions before being cooled, so as to avoid springing aftery being machined, and to eliminate op.

posed ber stresses in the material, thereby producing'a stronger and more perfect shaft, with lower cost, than is practicable in the ordinary practice of manufacture.

The improvement claimed is hereinafter fully set forth.

.ln the accompanying drawings: is a view, in elevation, oit' a prelineinarilyformed cranl shaft blank, suited orthe application of my invention, as seen inclined to the lines ot vision; Fig. 2, an endview of the same; Fig. 3, a view, similar to Fig. l, showing the blank in the form Which is imparted to it by the rst bending operation; Fig. 4c, an yend View or" the blank shown in Fig. 3; Fig. 5, a-vievv, similar to Fig. l, et the completely orrnedfcranlr shaft; Fig. 6, an endview of the saine; 7, a plan or top View on? the xecl bottom die; Fig. 8, an end View of the same; Fig. 9, a plan or top viewI ofthe inovabletop die; Fig. 10, an end view of the sance;Y Figs. il., l2 and i3, transverse sections through the diesen the lines a a, and c a, respectively, er Fig. 7 Fig. lei', a similar section through the top die, on

the line Ztl oli 9; and, Figs. l5, 16, ,and l?, side views, in' elevation, et the bending WrenchesV Figure l" l Specification of Letters-'Patent lP-ilggud Aug, 119, Application filed lcbruary 2li, i513. erial No. 27569,144. Y

My invention isl herein exemplified as ap plied in alining thel shaft journals and bringing intoproper relation, one to the others and to the shaft journals, the several crank arms of n. preliniinarily'formed nmltiple throw crank shaft, comprising .end journals, l, la, intermediate journals,'1*, l, and crank arms 2, 2a, 2b, 26,21, 2e, 2f, and 2g, which are connected one to another by crank pins, 3, 3A, 3b, 3, and 3, all'tlie crank arms being, in the preliminary blank operated'on in. the same longitudinal plane and perpendicular to lthe axial line of the crank shaft, as shown in Figs. yl and 2.

lor the practice of my invention, I provide a fixed Vbottom die and a movable top die, the former comprising two sections,e, 4l, adapted to abut longitudinally one against the other, and having dovestailed tongues, 4, on their lower sides, iitting, when the sections are brought into contact, in a recessy in a. suitable base, 5, within which they are secured by Wed-ges, 5, The bottom die sections are provided with a plurality of re cesses or pockets, adapted to receive different portions of the crank shaft blank, these being formedand disposeclas follows, View i' ingtliecrankshalt fromthe left, in Fi s. 1, v

3, ando, and the bottom die sections rom the top, in Fig. 7, and considering the regis tering portions of each of them, in the two die sections, as constituting a single receiving space: A. rectangular end recess, 211, y

which is formed longitudinally at one end of thedie sections, inthe middle plane thereof, is adapted to receive the end journal, 1, of the crank shaft blanlniand ay correspondv ing longitudinal recess, 4&1, at the'lopposite end of the die sections, is adapted to receive the opposite end journal, la. Two parallel flat sided transverse recesses, t2 and 42, are

located in position vto receive the crank arms, 2 and 2, and tvrorsixnilar recesses, 42'? and 42g, are. located in "position to receive the crank arms, 2 and' 2g.. As; shown in the transverse'secticns" of the bottom die', Figs.

1i and 1e, the recesses, e2 and lie, have e vertical end tace in one of the die sections' andA an opposite inclined face in the other, and the recesses, 42e and fllf, are similarly formeel, but their inclined faces stand at a greater angle te their 'bases than those of the recesses, 42 and 42g. Next adjoining the recess, 42a, a longitudinal. recess, 43, sebstantially. rectangular in.` section, is pro'- vided to receive the eranlrxplnf, the crank arnnf, and the' journal, lb., and" next, adjoining the recess, 2f-a similar 'recess-43,

is forined'to receive the' crank "pin, f3, theA crank erung-2", and .the journal, le. Next adjoining the recess, gt3, a transverse recess, 4:2", formed to'reccive the cranl arm, i2, and/next adjoiningA the recess, e3?, a recess,- 42, termedV tureceive the crank erin, 42d.' As shown in Fig. 13, the recesses, 412, and'tZd, correspond in form with the recesses, L2 `and tQ, but diler'therefromy as to the locationot their inclined ends, which are in the die section opposite that in which the inclined ends of the recesses, 4t2 and 42g, are formed. The recesses, 4&2 and 42d, are connected by a longitudinal recess, which receives the crank pin, 3b.

The movable top die, 6, visa strongand heavy plate of metal, corresponding in forni and dimensions with the fixed bottom die, when the sections of the latter are connected tor operation, and is provided, on` its upper side, with a longitudinal dovetail tongue, 6 3, for connection with any suitable known ineens :tor moving it toward and vtroni the bottoni die in the operation of bendingthe crank arms of the preliminary blank into desired angular relation. Projections, 6 1" wid 61, are formed on the bottom of the c, f5, in position to be brought against the join'nals, 1* and l, of the blank, when said. journal s rest in. the recesses, 43 and 43"', and projections, l and G1, depend from the bottom of lthe die, 6, in position to be brought against the journals, `2l and l?. Projcctions,` 63 and 63d, are'forrned on the bot tom or" the die, 6, in position to be brought against the crank` Ivins, 3 and 3d. Projections, 63h, are also .iorined on the bottom of the die, (l, in position lobe brought against the crank pin, 3b, on opposite sides of a collar which is shown as formed on the middle 'portion thereof. I

l" also provide a set of bonding wrenches, 7, and 7b, cach of which comprises astruight body of rectangular section, and a laterally inclined. head, the angles of'which heads to tric bodies are in contorniity with hose desired. for the crank a. 1ns to which the wrenches are to be applied. A jaw, 7G, is forincd in. the head o'lf cach of the wrenches, and :i marved cuni surface, 7, is i'mfmcd on the endet the body.

ln the operation of niv invention, 'the preliminary ycrank shaft blank, in the form `shownin Figs. Yl and 2, having been heal'yed to a proper trnn'ierature, is placed .in the bottom die, which. holds the crank arms, 2h `l"nl 9rigidlv in a vertical position, and eniigcs-i'with the crank pins, 3a and 3, and with the intermediate journals, lf and` l. 'The jaws or.' two of the wrenches, 7, are also applied to the crank pins, 3 and 3f?, and those olf two wrenches, 7b, to the crank Qin, f3", thc'opposite ends of the wrenches being similar isb,

eiser avenants corr "eerdere located in position to be acted on by the top die, 6, The top die, 6, is then forced' downwardly, in the 'ordinary manner, and the crank pins, 3 land 3d, together with the crank arms, 2, 2a, 2f, and Qfare bent until said crank arms are brought toanangle of 30 del grecs to the vertical plane, as indicated in Figs, 3 and 4. The 'crank pin, 3, together with the' crank arms, 2C4 and 2d, is also bent, in the opposite direction, until said crank arms are brought to an angle oi' 60 degrees with the vertical plane. This bendingoperation is et'ected by the pressure of the .top

die, 6, on the curved cain surfaces of the wrenches, the down vard movement of which is properlyl limited y the bottoms of the recesses in the lixed bottom die. The release or upward stroke of the top die completes the :tiret operation, at the 1 termination' o'l" which it will be seenthat the crank argus, 2 and 2g, remainat the saine inclination 'as the adjacent crank arms, 2a and 2f, and that the journals, l Aand l, are out of line with the journals, l" and 1. The crankshaftblank is brought to completed form by a second operation, preparatory' to which wrenches, 7, are engaged with the crank pins, "3 and 31.

4The top die, 6, is then again forced downward, and the crank arms, 2 and 2g, are brought to an angle of 60 degrees with the vertical plane, being bent. until the wrenches come in contact with the bottoms of the recesses offs-he bottom die, with which they are in line, and the journals, l and la, are

forced into line axially with the journals, 1? and le. To insure such axial' alinement, wedge bars, 81, 81, are' driven transversely in the bottom die, below the journals, .1 and la, and, by their 'wedging action, force said journals firmly against the .correspondingly wedge formed downward projections, 61 and (ila, ofthe top die, 6. The downward projections, 63 and 63, similarly bear against and hold the crank pins, 3 and 8?, and the downward projections 63h, have the vsame effect on the crank pin, 3b. The release or upward movement of the top vdie completes the second bending,` operation, by which the crank shaft is brought to' proper Vforni for being machined, its crank pins being then' ylength oi".- the dies and the 'number of recesses and projections therein and thereon,

they may be adapted tothe manufacture of crank shafts having a' greater vnumber' of cranks than that herein described, and, conversely, may be adapted to the manufacture vof crank shafts having a less number of romero ranks, by correspondingly decreasing the .lumber ot the recesses and projections.

l claim as my invention and desire to se- I lmavcment of the top (lic, 't or bending crank I arms of thc ti'ormefl blank out of their original positions. Y

in, an apparatus for the manufacture ot' multiple throw crank shafts, tbe combination ot a tixetl bottom tlie having,` a plurality o't' recesses, each atlaptctl to receive a portion ot a prcliminarily formed blank, a movable top lie having projections located in position 'to be brought against portions of sut-h blank, :tml a plurality of bending \\'rcn hcs', actuated by the movement of the top (lie, nach having' a jaw adapted to ensie a portion of thc formed blank.

2%. in an apparatus for the manufacture of multiple throw crank shafts, the combination ofa fixed bottom cliehaving a plurality oit recesses, each adapted. to receive a portion of a preliminarily formeel blank, a movable top (lie baring projections located in position to be brought against portions of .such blank, and movable Wedge bars projecting; into rece c s ot tbe bottom die in position to abut against journal portions of tbc foi-meti blank.

4. In an apparatusjtor tbe manufacture of multiple throw crank shafts, the combination o't' a laterally separable sectional iXeol bottom (liey having,- a plurality of recesses, cacb adapted to receive a portion of a. preliminaril;r formed blank, means for securing the sections ot tbe bottom (tie in a supporting' base, a movable top (lic having projections located. in position to be brought against. portions ot such blank, and means,

actuated by the movement of the top (lie, for bending crank arms ot the formed blank out oi' their original positions.

PATRICK A. LEONARD. Witnesses CHARLES L. fllutstnn, Vv' 1m, XV. HAMBLY. 

